2006 GMC Envoy Envoy xl

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2006 GMC ENVOY

4.2L

6 CYL

2WD

AUTOMATIC

80 MILES

I have a 2006 envoy 4.2 l6 with no spark at the coils. The pink wire has 12 volts, ground is good and trigger cycles on and off with a sensor safe test light, The fuel pump runs and is pressurized. My scan tool shows no rpm on graph while cranking. Someone else changed the pcm and had it flashed for the vin. It need the relearn for crank sensor. It has code p2138 the gas petal tps data shows the gas pedal at 40% without pressing the pedal at all.I tested the ignition switch steering harness feed wires and all show power orange brown etc. When I remove the fuel relay and spray starting fluid it fires on 1 cylinder but when I remove the coil packs and ground the screw that holds the coil No spark from the tester. The crank sensor is 2 wire and reads 740 ohm or 230 max millivolt between purple and yellow. Thanks

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Friday, April 25th, 2014 AT 7:25 PM

3 Replies

SATURNTECH9

EXPERT

You cant relearn the crank unless the engine runs if I were you I would be fixing the code p2138 if the computer sees a active problem in the throttle by wire system the computer will disable engine starting. Its a safety feature so you dont go out and drive with a problem with the throttle by wires system. Thats where I would start.